Android Studio NFC片段

Question

我想通过NFC从手机向另一个手机发送一个String，我有2个选项卡，它们是片段。一个选项卡上有一个发送按钮，另一个选项卡上有一个接收按钮。想法是，当我单击发送按钮时，它将触发NFC并发送String，因为其他移动设备可以单击按钮来接收，因此它将触发NFC来获取东西。然后它将在“接收”选项卡中显示为编辑文本。

非常感谢！

TAB 1

protected void onCreate(Bundle savedInstanceState) {
   sendNFC = (Button)v.findViewById(R.id.SendNFC_button);
    sendNFC.setOnClickListener(new View.OnClickListener() {
        sendNFC.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String receive = getActivity().getIntent().getExtras().getString("TEXT");
            EditText.setText(receive);

        }
    });
}
    }

TAB 2

protected void onCreate(Bundle savedInstanceState) {
   sendNFC = (Button)v.findViewById(R.id.SendNFC_button);
    sendNFC.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            sendToNFC(v);
        }
    });

    return v;
}



    }

    public void sendToNFC (View view){
    Intent intent = new Intent(getActivity(), nfc_activity.class);
    intent.putExtra("TEXT");
    startActivity(intent);
}

NFC

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_nfc);
    text = (TextView) findViewById(R.id.text);
    nfcAdapter = NfcAdapter.getDefaultAdapter(this);

   if (getIntent().getStringExtra("TEXT") != null) {
        contentText = getIntent().getStringExtra("TEXT");
        Intent intent = new Intent(this, TabsActivity.class);
        intent.putExtra("TEXT");
        startActivity(intent);


    }



    if (nfcAdapter == null) {
        Toast.makeText(this, "No NFC", Toast.LENGTH_SHORT).show();
        finish();
        return;
    }

    pendingIntent = PendingIntent.getActivity(this, 0,
            new Intent(this, this.getClass())
                    .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
}

@Override
protected void onResume() {
    super.onResume();

    if (nfcAdapter != null) {
        if (!nfcAdapter.isEnabled())
            showWirelessSettings();

        nfcAdapter.enableForegroundDispatch(this, pendingIntent, null, null);
    }
}

@Override
protected void onPause(){
    super.onPause();

    if (nfcAdapter != null){
        nfcAdapter.disableForegroundDispatch(this);
    }

}

@Override
protected void onNewIntent(Intent intent) {
    setIntent(intent);
    resolveIntent(intent);
}

private void resolveIntent(Intent intent) {
    String action = intent.getAction();

    if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
            || NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
            || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
        Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
        NdefMessage[] msgs;

        if (rawMsgs != null) {
            msgs = new NdefMessage[rawMsgs.length];

            for (int i = 0; i < rawMsgs.length; i++) {
                msgs[i] = (NdefMessage) rawMsgs[i];
            }

        } else {
            byte[] empty = new byte[0];
            byte[] id = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
            Tag tag = (Tag) intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
            byte[] payload = dumpTagData(tag).getBytes();
            NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, id, payload);
            NdefMessage msg = new NdefMessage(new NdefRecord[] {record});
            msgs = new NdefMessage[] {msg};
        }

        displayMsgs(msgs);
    }
}

private void displayMsgs(NdefMessage[] msgs) {
    if (msgs == null || msgs.length == 0)
        return;

    StringBuilder builder = new StringBuilder();
    List<ParsedNdefRecord> records = NdefMessageParser.parse(msgs[0]);
    final int size = records.size();

    for (int i = 0; i < size; i++) {
        ParsedNdefRecord record = records.get(i);
        String str = record.str();
        builder.append(str).append("\n");
    }

    text.setText(builder.toString());
}


private void showWirelessSettings() {
    Toast.makeText(this, "You must enable NFC", Toast.LENGTH_SHORT).show();
    Intent intent = new Intent(Settings.ACTION_WIRELESS_SETTINGS);
    startActivity(intent);
}